Amdesco Puerto Rico Flag, Puerto Rican Flag and Country Shape Men's T-Shirt Shirts are 100% pre-shrunk cotton; Athletic Heather Gray is 90/10 pre-shrunk cotton/polyester blend All Shirts are designed and printed in the United States Design is printed on the front of the shirt; Back of shirt is blank Machine wash cold inside out; Tumble dry on low heat Perfect gift for all holidays and occasions; Satisfaction is Guaranteed!